CH268951A - Current transformer with windings embedded in a solid insulating compound. - Google Patents
Current transformer with windings embedded in a solid insulating compound.Info
- Publication number
- CH268951A CH268951A CH268951DA CH268951A CH 268951 A CH268951 A CH 268951A CH 268951D A CH268951D A CH 268951DA CH 268951 A CH268951 A CH 268951A
- Authority
- CH
- Switzerland
- Prior art keywords
- current transformer
- winding
- transformer according
- insulating compound
- solid insulating
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Description
Stromwandler mit in einer festen Isoliermasse eingebetteten Wicklungen. Im Bestreben, öllose Stromwandler her zustellen, hat man im Laufe der Zeit Strom wandlerwicklungen mit Asphaltkompound imprägniert, wobei als Füllmasse nach Bedarf Papier, Baumwolle oder dergleichen ange wendet wurde. Diese Isoliermethode hat den wesentlichen Nachteil, dass sich das Isolier mittel bei höheren Temperaturen wiederum erweicht; anderseits kann sich bei Verwen dung von Kompound mit hohem Tropfpunkt Rissbildung einstellen. Gleichzeitig lässt aber auch das Aussehen eines - derart behandelten Stromwandlers zu wünschen übrig, da sich eine glatte Oberfläche nicht ohne weiteres erreichen lässt.
Mit der Entwicklung der härtbaren Giess harze ergeben sich für die Isolation von Stromwandlern weitgehende Möglichkeiten, indem diese Harze in gehärtetem Zustande bei hohen Temperaturen nicht mehr erweichen, sondern ihre mechanische und dielektrische Festigkeit beibehalten. Infolge der verschie denen Wärmeausdehnungs-Koeffizienten von Wicklungen und Ausgiessmasse besteht immerhin eine gewisse Gefahr infolge Riss- bildung, was sich aber meistens vermeiden lässt, wenn bei günstiger Formgebung der Wicklung und bei Anwendung von Gleit- mitteln ein Anhaften der Giessmasse verhindert wird.
Gemäss der Erfindung besteht nun bei einem Stromwandler mit in einer festen Isolier masse eingebetteten Wicklungen diese Isolier masse mindestens zum Teil aus einem durch Giessen in die gewünschte Form gebrachten und durch Polymerisation gehärteten Kunst- stoff, welcher die Beibehaltung der mechani schen und dielektrischen Festigkeit bei allen Betriebstemperaturen gewährleistet.
Damit können die hiervor genannten Nachteile be hoben werden. Einenteils kann man durch Beimischung eines Füllmaterials die Aus- dehnungs-Koeffizienten von Polymerisation und Wicklung bestmöglich abstimmen. Andern teils kann durch Verwendung von elastischen Körpern für die Ummantelung der Wicklung ein Ausgleich der Ausdehnungs-Koeffizienten geschaffen werden.
Einen Stromwandler gemäss der Erfindung zeigt beispielsweise Fig. 1, und zwar im Schnitt. Fig. 2 ist ein Schnitt nach der Linie rl-A der Fig. 1. In einem zweiteiligen Gehäuse 1 ist das als Mantelkern ausgebildete aktive Eisen 2 untergebracht. Im Gehäuse 1 ist durch provisorisch eingefügte Distanz stücke die Primärwicklung 3 eingebaut. Die Distanzstücke bestehen aus Polymerisat und vereinigen sich nach beendetem Ausguss als Ganzes fugenlos mit dem übrigen Polymerisat 5. Die sekundäre Wicklung 4 samt den Klem men 6 ist ebenfalls mit dem Polymerisat umgeben.
Um den Differenzen in den Ausdehnungs- Koeffizienten von Polymerisat und Wicklungs körper zu begegnen, ist die Wicklung mit einer elastischen Bandage 7, beispielsweise aus Gummiband, umwickelt. Statt dessen könnte die Wicklung mit einer elastischen Masse umpresst sein. Damit jedoch die Bandage 7 oder die Umpressung elektrisch nicht bean sprucht werden, sind sie mit einer leitenden Bandage 8 überdeckt, die mit der Wicklung leitend verbunden ist. Statt dessen kann aber auch durch ein Spritzverfahren das Ganze mit einem Metalliiberzug versehen werden.
Da das Polymerisat 5 am obern Teil über das Gehäuse 1 hinausragt, ist es not wendig, an dieser Stelle durch eine zweiteilige Form das Abfliessen des polymerisierenden Kunststoffes bis zur völligen Erstarrung zu verhindern.
Als Füllmaterialien dienen in vorteilhafter Weise unter anderem Schiefermehl, Quarzsand oder Glaswolle.
Weitere Ausführungsbeispiele von Teilen des erfindungsgemässen Stromwandlers zeigen die Fig. 3 und 4, und zwar für Stromwandler für sehr hohe Spannungen. Eine ringförmige Primärwicklung 3 ist durch eine zweiteilige Metallhülse 12 überbrückt und mit einer elastischen Bandage 7 versehen. Ein leiten der Belag 13 sorgt auch hier dafür, dass die Bandage 7 elektrisch nicht beansprucht wird.
Da in diesem Falle die Wicklung für sich allein mit polymerisierendem Kunststoff um gossen wird, muss erstere vor dem Giessen in eine zweiteilige Giessform gebracht werden, wobei wiederum entsprechende Distanzstücke notwendig werden. Nach dem Ausguss wird der ringförmige Teil der isolierten Wicklung mit einem leitenden Erdbelag 14 versehen, welcher nach dem Einbau der Wicklung mit der Erde verbunden wird.
Das Beispiel Fig. 4 unterscheidet sich von demjenigen nach Fig. 3 durch Anwendung eines gewellten Metallrohres 15 zur Ermög lichung einer ungehinderten Ausdehnung der Wicklung bei Erwärmung derselben. Die An ordnung des Wellblechrohres 15 ist so getrof- fen, dass sich bei Temperaturänderungen die Wicklung im Isolierkörper frei bewegen kann. An Stelle des Wellbleches kann auch hier dünnes, weiches Blech verwendet werden, welches sich unter der Wirkung des beim Härten schrumpfenden Kunststoffes stauchen lässt.
Current transformer with windings embedded in a solid insulating compound. In an effort to produce oil-free current converters, current converter windings have been impregnated with asphalt compound over time, paper, cotton or the like being used as filler material as required. This isolation method has the major disadvantage that the insulating medium softens again at higher temperatures; on the other hand, when using compounds with a high dropping point, cracking can occur. At the same time, however, the appearance of a current transformer treated in this way also leaves something to be desired, since a smooth surface cannot easily be achieved.
With the development of curable casting resins there are extensive possibilities for the insulation of current transformers in that these resins no longer soften in the cured state at high temperatures, but instead retain their mechanical and dielectric strength. As a result of the different thermal expansion coefficients of the windings and the pouring compound, there is at least a certain risk of cracking, but this can usually be avoided if the pouring compound is prevented from sticking with a favorable shape of the winding and the use of lubricants.
According to the invention, in a current transformer with windings embedded in a solid insulating compound, this insulating compound consists at least in part of a plastic that has been molded into the desired shape and cured by polymerization, which maintains the mechanical and dielectric strength of all Operating temperatures guaranteed.
The disadvantages mentioned above can thus be eliminated. On the one hand, the expansion coefficients of polymerisation and winding can be matched as best as possible by adding a filler material. On the other hand, by using elastic bodies for the sheathing of the winding, a compensation of the expansion coefficients can be created.
A current transformer according to the invention is shown, for example, in FIG. 1, specifically in section. Fig. 2 is a section along the line rl-A of Fig. 1. The active iron 2, designed as a jacket core, is accommodated in a two-part housing 1. In the housing 1, the primary winding 3 is installed by temporarily inserted spacers. The spacers are made of polymer and unite as a whole seamlessly with the rest of the polymer 5 when the pouring is complete. The secondary winding 4 including the clamps 6 is also surrounded by the polymer.
In order to counter the differences in the expansion coefficient of polymer and winding body, the winding is wrapped with an elastic bandage 7, for example made of rubber band. Instead, the winding could be pressed around with an elastic compound. However, so that the bandage 7 or the pressing are not electrically claimed bean, they are covered with a conductive bandage 8 which is conductively connected to the winding. Instead, the whole can be provided with a metal coating by a spraying process.
Since the polymer 5 protrudes on the upper part of the housing 1, it is necessary to prevent the polymerizing plastic from flowing out until it solidifies at this point by means of a two-part mold.
Slate powder, quartz sand or glass wool, among others, are advantageously used as filling materials.
Further exemplary embodiments of parts of the current transformer according to the invention are shown in FIGS. 3 and 4, specifically for current transformers for very high voltages. An annular primary winding 3 is bridged by a two-part metal sleeve 12 and provided with an elastic bandage 7. Conducting the covering 13 here also ensures that the bandage 7 is not subjected to electrical stress.
Since in this case the winding is cast by itself with polymerizing plastic, the former must be placed in a two-part casting mold before casting, again with corresponding spacers being necessary. After the sink, the annular part of the insulated winding is provided with a conductive earth covering 14, which is connected to earth after the winding has been installed.
The example of FIG. 4 differs from that of FIG. 3 by using a corrugated metal tube 15 to enable unhindered expansion of the winding when heated. The arrangement of the corrugated iron pipe 15 is such that the winding in the insulating body can move freely when the temperature changes. Instead of the corrugated sheet, thin, soft sheet metal can also be used here, which can be compressed under the action of the plastic that shrinks during hardening.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH268951T | 1948-10-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH268951A true CH268951A (en) | 1950-06-15 |
Family
ID=4477087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH268951D CH268951A (en) | 1948-10-05 | 1948-10-05 | Current transformer with windings embedded in a solid insulating compound. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH268951A (en) |
Cited By (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1001754B (en) * | 1954-12-01 | 1957-01-31 | Koch & Sterzel Ag | Current transformer with a one-piece insulating body |
DE1018490B (en) * | 1953-02-25 | 1957-10-31 | Robert Hanning | Multi-layer plastic coating for electrical coils or windings |
DE1018985B (en) * | 1952-07-15 | 1957-11-07 | Moser Glaser & Co A G | In a one-piece synthetic resin insulating body, built in support construction, transducer and process for its production |
DE1029089B (en) * | 1952-02-13 | 1958-04-30 | Siemens Ag | Process to prevent cracking when dripping and sheathing of windings, especially for dry voltage converters |
DE1030449B (en) * | 1957-04-27 | 1958-05-22 | Siemens Ag | Choke coil, especially current-limiting choke coil for high-voltage systems |
DE970277C (en) * | 1955-01-23 | 1958-09-04 | Vacuumschmelze Ag | Method for solidifying toroidal cores, in particular toroidal tape cores, for protection against mechanical stresses |
DE970444C (en) * | 1953-08-18 | 1958-09-18 | Licentia Gmbh | Combined inductive current and voltage converter for high series voltages |
DE1051354B (en) * | 1956-02-21 | 1959-02-26 | Siemens Ag | Termination for electrical cables |
DE1072734B (en) * | 1960-01-07 | LICENTIA Patent-Verwaltungs GmbH Frankfurt/M | Dros seispule especially TFH lock and Kutzschlussbegrenrungsspule | |
DE1078222B (en) * | 1954-08-04 | 1960-03-24 | Messwandler Bau Gmbh | Resin encased transducer, especially for outdoor use |
DE1088122B (en) * | 1953-02-12 | 1960-09-01 | Hans Ritz Dr Ing | In particular, made of ceramic material or made of glass insulating body, which is connected on its outer circumference with a metal armature encompassing it by an originally flowable, insulating and hardening connecting means, preferably cast resin |
DE1108324B (en) * | 1952-01-30 | 1961-06-08 | Siemens Ag | Method for producing an electrical winding arrangement with a casing from a castable, thermosetting plastic compound and winding arrangement produced according to this method |
DE1111281B (en) * | 1954-08-07 | 1961-07-20 | Siemens Ag | Support head current transformer |
DE1112578B (en) * | 1952-01-30 | 1961-08-10 | Siemens Ag | Method for producing an electrical winding arrangement with a casing from a castable, thermosetting plastic compound |
DE1147684B (en) * | 1959-01-13 | 1963-04-25 | Transform Roentgen Matern Veb | Converter or transformer with cast resin insulation |
DE1154167B (en) * | 1957-02-13 | 1963-09-12 | Siemens Ag | Cast resin cable set with conductive inserts for potential control |
DE1161969B (en) * | 1958-09-04 | 1964-01-30 | Joseph Waldman & Sons | Arrangement for sealing electrical conductors in a head part |
DE976786C (en) * | 1954-04-25 | 1964-05-06 | Koch & Sterzel Kommanditgesell | Resin-insulated voltage transformer with pads around the active parts |
DE1174427B (en) * | 1957-10-09 | 1964-07-23 | Siemens Ag | Induction electricity meter |
DE1176227B (en) * | 1956-06-13 | 1964-08-20 | Pirelli | Cable connection (normal feed and termination connection) for single-core oil-filled high-voltage cables |
DE1182366B (en) * | 1956-02-04 | 1964-11-26 | Siemens Ag | An electrical device with a magnetic core and coil windings embedded in a hardening mass |
DE1209200B (en) * | 1961-07-03 | 1966-01-20 | Transform Roentgen Matern Veb | Process for the production of a rod current transformer with cast resin insulation |
DE1220501B (en) * | 1963-01-30 | 1966-07-07 | Licentia Gmbh | Electrical device encased in synthetic resin |
DE1224961B (en) * | 1959-11-27 | 1966-09-15 | Olympia Werke Ag | Electromagnetic input device for printing and / or computing machines |
DE1241908B (en) * | 1963-06-27 | 1967-06-08 | Licentia Gmbh | Capacitive voltage divider made in cast resin technology for measuring purposes |
DE1247472B (en) * | 1960-09-19 | 1967-08-17 | Transform Roentgen Matern Veb | Process for centering and subsequent potting of active components of transformers and converters |
DE1279163B (en) * | 1959-03-12 | 1968-10-03 | Calor Emag Elek Zitaets Ag | Switching bridge, z. B. in plug form, for the production of circuit connections |
DE1282169B (en) * | 1964-09-08 | 1968-11-07 | Transform Roentgen Matern Veb | Device for securing a core provided with a secondary winding for cast resin transducers, in particular a toroidal tape core, in a casting mold |
DE2541670A1 (en) * | 1974-09-19 | 1976-04-01 | Matsushita Electric Ind Co Ltd | REEL WITH RESIN PACKING |
DE10141985A1 (en) * | 2001-08-28 | 2003-04-03 | Daimler Chrysler Ag | Manufacturing electromagnets for actuators for electromagnetic valve control involves filling hollow spaces between winding wires of stimulation coil with filler material before inserting |
-
1948
- 1948-10-05 CH CH268951D patent/CH268951A/en unknown
Cited By (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1072734B (en) * | 1960-01-07 | LICENTIA Patent-Verwaltungs GmbH Frankfurt/M | Dros seispule especially TFH lock and Kutzschlussbegrenrungsspule | |
DE1112578B (en) * | 1952-01-30 | 1961-08-10 | Siemens Ag | Method for producing an electrical winding arrangement with a casing from a castable, thermosetting plastic compound |
DE1108324B (en) * | 1952-01-30 | 1961-06-08 | Siemens Ag | Method for producing an electrical winding arrangement with a casing from a castable, thermosetting plastic compound and winding arrangement produced according to this method |
DE1029089B (en) * | 1952-02-13 | 1958-04-30 | Siemens Ag | Process to prevent cracking when dripping and sheathing of windings, especially for dry voltage converters |
DE1018985B (en) * | 1952-07-15 | 1957-11-07 | Moser Glaser & Co A G | In a one-piece synthetic resin insulating body, built in support construction, transducer and process for its production |
DE1088122B (en) * | 1953-02-12 | 1960-09-01 | Hans Ritz Dr Ing | In particular, made of ceramic material or made of glass insulating body, which is connected on its outer circumference with a metal armature encompassing it by an originally flowable, insulating and hardening connecting means, preferably cast resin |
DE1018490B (en) * | 1953-02-25 | 1957-10-31 | Robert Hanning | Multi-layer plastic coating for electrical coils or windings |
DE970444C (en) * | 1953-08-18 | 1958-09-18 | Licentia Gmbh | Combined inductive current and voltage converter for high series voltages |
DE976786C (en) * | 1954-04-25 | 1964-05-06 | Koch & Sterzel Kommanditgesell | Resin-insulated voltage transformer with pads around the active parts |
DE1078222B (en) * | 1954-08-04 | 1960-03-24 | Messwandler Bau Gmbh | Resin encased transducer, especially for outdoor use |
DE1111281B (en) * | 1954-08-07 | 1961-07-20 | Siemens Ag | Support head current transformer |
DE1001754B (en) * | 1954-12-01 | 1957-01-31 | Koch & Sterzel Ag | Current transformer with a one-piece insulating body |
DE970277C (en) * | 1955-01-23 | 1958-09-04 | Vacuumschmelze Ag | Method for solidifying toroidal cores, in particular toroidal tape cores, for protection against mechanical stresses |
DE1182366B (en) * | 1956-02-04 | 1964-11-26 | Siemens Ag | An electrical device with a magnetic core and coil windings embedded in a hardening mass |
DE1051354B (en) * | 1956-02-21 | 1959-02-26 | Siemens Ag | Termination for electrical cables |
DE1176227B (en) * | 1956-06-13 | 1964-08-20 | Pirelli | Cable connection (normal feed and termination connection) for single-core oil-filled high-voltage cables |
DE1154167B (en) * | 1957-02-13 | 1963-09-12 | Siemens Ag | Cast resin cable set with conductive inserts for potential control |
DE1030449B (en) * | 1957-04-27 | 1958-05-22 | Siemens Ag | Choke coil, especially current-limiting choke coil for high-voltage systems |
DE1174427B (en) * | 1957-10-09 | 1964-07-23 | Siemens Ag | Induction electricity meter |
DE1161969B (en) * | 1958-09-04 | 1964-01-30 | Joseph Waldman & Sons | Arrangement for sealing electrical conductors in a head part |
DE1147684B (en) * | 1959-01-13 | 1963-04-25 | Transform Roentgen Matern Veb | Converter or transformer with cast resin insulation |
DE1279163B (en) * | 1959-03-12 | 1968-10-03 | Calor Emag Elek Zitaets Ag | Switching bridge, z. B. in plug form, for the production of circuit connections |
DE1224961B (en) * | 1959-11-27 | 1966-09-15 | Olympia Werke Ag | Electromagnetic input device for printing and / or computing machines |
DE1247472B (en) * | 1960-09-19 | 1967-08-17 | Transform Roentgen Matern Veb | Process for centering and subsequent potting of active components of transformers and converters |
DE1209200B (en) * | 1961-07-03 | 1966-01-20 | Transform Roentgen Matern Veb | Process for the production of a rod current transformer with cast resin insulation |
DE1220501B (en) * | 1963-01-30 | 1966-07-07 | Licentia Gmbh | Electrical device encased in synthetic resin |
DE1241908B (en) * | 1963-06-27 | 1967-06-08 | Licentia Gmbh | Capacitive voltage divider made in cast resin technology for measuring purposes |
DE1282169B (en) * | 1964-09-08 | 1968-11-07 | Transform Roentgen Matern Veb | Device for securing a core provided with a secondary winding for cast resin transducers, in particular a toroidal tape core, in a casting mold |
DE2541670A1 (en) * | 1974-09-19 | 1976-04-01 | Matsushita Electric Ind Co Ltd | REEL WITH RESIN PACKING |
DE10141985A1 (en) * | 2001-08-28 | 2003-04-03 | Daimler Chrysler Ag | Manufacturing electromagnets for actuators for electromagnetic valve control involves filling hollow spaces between winding wires of stimulation coil with filler material before inserting |
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